Copenhagen, Denmark (CNN)Celebrated Danish architect Bjarke Ingels' distinctive buildings are redefining skylines across the globe, from landmark projects in his native Copenhagen to the rebuilding of Two World Trade Center in New York.

Set to open in 2018, BIG's proposed designs include a tower that emits smoke rings to remind the public of their carbon emissions, and a ski slope on the roof.

"We thought 'Why not make the roof into a public park?' And because we don't have hills in Denmark, we would make it into a ski slope," he explained in the latest episode of CNN Style.

"We don't do things just for fun. We actually like to have fun, and I think you should take fun seriously, but our buildings end up looking different because they perform differently. The power plant ends up looking like a ski slope because it is actually a ski slope."